FreeBSD : FreeBSD -- kernel memory disclosure from /dev/midistat (5027b62e-f680-11e9-a87f-a4badb2f4699)

High Nessus Plugin ID 130245


The remote FreeBSD host is missing one or more security-related updates.


The kernel driver for /dev/midistat implements a handler for read(2).
This handler is not thread-safe, and a multi-threaded program can exploit races in the handler to cause it to copy out kernel memory outside the boundaries of midistat's data buffer. Impact : The races allow a program to read kernel memory within a 4GB window centered at midistat's data buffer. The buffer is allocated each time the device is opened, so an attacker is not limited to a static 4GB region of memory.

On 32-bit platforms, an attempt to trigger the race may cause a page fault in kernel mode, leading to a panic.


Update the affected packages.

See Also

Plugin Details

Severity: High

ID: 130245

File Name: freebsd_pkg_5027b62ef68011e9a87fa4badb2f4699.nasl

Version: 1.2

Type: local

Published: 2019/10/25

Updated: 2019/12/18

Dependencies: 12634

Configuration: Enable paranoid mode

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

CVSS v3.0

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:freebsd:freebsd:FreeBSD, cpe:/o:freebsd:freebsd

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info, Settings/ParanoidReport

Exploit Ease: No known exploits are available

Patch Publication Date: 2019/10/24

Vulnerability Publication Date: 2019/08/20

Reference Information

CVE: CVE-2019-5612

FreeBSD: SA-19:23.midi